Instruction manual

Networked PIP Series

page 32

Reference Manual

5.2.18 Input Signal Compressor/Limiter

An input signal compressor/limiter is available for each channel. Five parameters control

this feature:

Enable: Enables or disables this function.

Threshold: Sets the level, in dBu, above which the compressor begins to attenuate the

input signal. This level corresponds to the input level meter reading. The compressor is

“feed-forward,” meaning that the level detection point is located before the gain control

stage. The range is from +20 dBu to – 50 dBu.

Hysteresis: A “dead zone” that ensures a significant change before acting. The range is

from 0 to 12 dB. It requires the signal to go above the upper threshold before engaging and

to go below the lower threshold before releasing. Hysteresis is not included in the standard

System Architect control panel, but it is available on a custom control page.

Attack Time: Sets the attack time of the compressor. The attack time is defined as the time

it takes the compressor to attenuate the signal gain by 20 dB. The range is from 1 millisec-

ond to 0.1 second.

Release Time: Sets the release time of the compressor. The release time is defined as the

time it takes the compressor to increase the signal gain by 20 dB. The range is from

10 milliseconds to 10 seconds.

Compression Ratio: Sets the compression ratio of the compressor. The ratio is the rela-

tion between the amount of attenuation applied by the compressor verses the amount that

the input signal is over the threshold. The available settings are 2:1 to 32:1.

Beyond the three controls for each channel, a single-control Compressor Tie connects

the compressors together. The compressors are tied at their sense points, meaning that the

greater of the two input signals will be used as stimulus for both compressors. Each com-

pressor will still compress based on its individual threshold, attack, release and ratio set-

tings. Compressor Tie is not included in the standard System Architect control panel, but it

is available on a custom control page.

5.2.19 Peak Voltage Limiter

This limits the peak voltage output of the amplifier. Four parameters control this limiter for

each channel:

Enable: Enables or disables this function.

Threshold: Sets the level, in absolute voltage, which the limiter will allow from the ampli-

fier. The range is from 12 V

to 255 V

pk.

Attack Time: Sets the attack time of the limiter. The attack time is defined as the time it

takes the limiter to attenuate the output signal by 20 dB. The range is from 1 millisecond to

100 milliseconds.

136763-7_4-08_networked_pip-series_reference_manual.fm Page 32 Monday, March 17, 2008 11:17 AM